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• In SQL, can we always write an inner join statement as a main query and subquery?

  - by Jian Lin

  In SQL, can we always write an inner join statement as a main query and subquery? For example, select * from gifts g where g.giftID in (select giftID from sentGifts); can do a join and show the gifts sent in the sentGifts table, but it won't be able to show the sentTime because that is inside the subquery?

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• adding checkbox to a dropdown

  - by Radhe

  <select><option><input type="checkbox" />Headache</option></select> By using the above code i did't get a check box inside a dropdown list.Can you suggest me , how should i proceed.

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• T-SQL Subquery Question

  - by Nick

  Hi, i have two queries. For each tuple of query1 i want to run query2. i dont want to use cursors. i tried several approaches using subqueries. query1: select distinct category, Count(category) as CategoryCount from mytable group by category query2: select top 3 Text, Title, Category from mytable where Category = '1' Category = '1' is a sample. the value should come from query1

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• Which mysql construct is faster?

  - by Olaseni

  SELECT ..WHERE COL IN(A,B) or SELECT ... WHERE (COL = A or COL = B) I'm trying to find out what are the differences between the two constructs? Would there be significant performance gains either way if utilized on resultsets that are nearing the 1 million mark?

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• Converting an int to an IP address

  - by User1

  Is there an easy way to convert an int to an IP address in PostgreSQL? I was able to go from IP to int using this code: SELECT inet '1.2.3.4'-'0.0.0.0' This doesn't work: SELECT 16909060::inet I didn't see anything in the documentation. Does anyone know how to do this?

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• List Box Multiple Selection Problem

  - by rupeshmalviya

  Hello Friends I am using a list box control in aspx page i have set multiple selection property to true, but when i try to select more than one item it does not select multiple items, it selects one only do i have to do something programatically here is my code on code behind nothing ...i want why it is not selecting more than one item's .. i am using namespace using System.Web.UI.WebControls; as well but of no avail..

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• Selecting rows distinctively

  - by noway

  Lets assume my database table structure is something like | items | weight | |============|==========| | item_1 | 50 | | item_2 | 90 | | item_2 | 45 | | item_2 | 60 | | item_3 | 40 | In the select statement, I want to show an item only for once with the highest weight also ordered by height. So the result should be : | items | weight | |============|==========| | item_2 | 90 | | item_1 | 50 | | item_3 | 40 | I tried something like SELECT DISTINCT items, weight FROM mytable ORDER BY weight DESC but it didn't work because the results are actually distinct. How can I make that selection?

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• Rails 2.3: How to turn this SQL statement into a named_scope

  - by randombits

  Having a bit of difficulty figuring out how to create a named_scope from this SQL query: select * from foo where id NOT IN (select foo_id from bar) AND foo.category = ? ORDER BY RAND() LIMIT 1; Category should be variable to change. What's the most efficient way the named_scope can be written for the problem above?

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• Concatenate a table name from a variable in a FROM clause

  - by idieeasy

  I'm trying to use a dynamically generated fully-qualified table name in sql server 2008. For example, this does not work: select max([id]) from @dbName+N'.[T1]' This will give an error like: Msg 102, Level 15, State 1, Line 73 Incorrect syntax near '+'. I know that something like this works: declare @qualifiedTable varchar(200) = @dbName+N'.[T1]' select max([id]) from @qualifiedTable But I have to do this LOTS of times so I would really like to do it in line. Is it possible?

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• [Django] How do I filter the choices in a ModelForm that has a CharField with the choices attribute

  - by nubela

  I understand I am able to filter queryset of Foreignkey or Many2ManyFields, however, how do I do that for a simple CharField that is a Select Widget (Select Tag). For example: PRODUCT_STATUS = ( ("unapproved", "Unapproved"), ("approved", "Listed"), #("Backorder","Backorder"), #("oos","Out of Stock"), #("preorder","Preorder"), ("userdisabled", "User Disabled"), ("disapproved", "Disapproved by admin"), ) and the Field: o_status = models.CharField(max_length=100, choices=PRODUCT_STATUS, verbose_name="Product Status", default="approved") Suppose I wish to limit it to just "approved" and "userdisabled" instead showing the full array (which is what I want to show in the admin), how do I do it? Thanks!

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• Can get Sum() working in Northwind example

  - by Vince

  Hi, The following code is generating a runtime error and I have no idea why. from o in Orders group o by o.Employee into employeeOrders select new { employeeOrders.Key.EmployeeID, employeeOrders.Key.FirstName, Orders = from eord in employeeOrders orderby eord.OrderID select new { eord.OrderID, eord.OrderDate, OrderTotal=eord.OrderDetails.Sum (od => od.UnitPrice) } } The error is Member access 'System.Decimal UnitPrice' of 'LINQPad.User.OrderDetails' not legal on type 'LINQPad.User.Orders Thanks in advance

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• SSIS to copy data from one table to another, where not in destination table

  - by alex

  I'm in the process of creating an SSIS package on a server (server1) that looks at the data in a sql db on another site (server2) and copies relevant rows across. The SQL statement required is: SELECT * FROM server2.ordersTable WHERE OrderID Not In (SELECT OrderID FROM server1.ordersTable This selects data from server1 which isn't in the table on server2 (based on order id) I then need to insert the result into a table on server1 How would I approach this? What components do I need etc...?

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• How to convert a "dd/mm/yyyy" string to datetime in MSSQL ?

  - by Sim

  I tried this SELECT convert(datetime, '23/07/2009', 111) but got this error The conversion of a varchar data type to a datetime data type resulted in an out-of-range value. However SELECT convert(datetime, '07/23/2009', 111) is OK though How to fix the 1st one ? Thanks

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• News Portals and mysql queries

  - by jasmine

  Consider a news portal like cnn. There is 8 categories. Is there 8 query in every page loading? For eg SELECT title FROM category where cID = 1 SELECT title FROM category where cID = 2 ................... And for sites with high traffic, would be memcache a good solution? Thanks in advance

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• seperated mysql statement query in php

  - by stone

  So, I can run the following statements from within mysql itself successfully. SET @fname = 'point1'; SELECT * FROM country WHERE name=@fname;` But when I try to pass the query through php like this and run it, I get an error on the second line $query = "SET @fname = 'point1';"; $query .= "SELECT * FROM country WHERE name=@fname;";

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• Efficient SQL to count an occurrence in the latest X rows

  - by pulegium

  For example I have: create table a (i int); Assume there are 10k rows. I want to count 0's in the last 20 rows. Something like: select count(*) from (select i from a limit 20) where i = 0; Is that possible to make it more efficient? Like a single SQL statement or something? PS. DB is SQLite3 if that matters at all...

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• insert exclusive locking

  - by Markus

  Hi, I have thought about the following SQL statements: INSERT INTO A(a1, a2) SELECT b1, udf_SomeFunc(b1) FROM B Where udf_SomeFunc makes a select on table A. As I understand, first, a shared lock is set on A (I am talking just about table A now), then, after this lock is released, an exclusive lock is obtained to insert the data. The question is: is it possible, that another transaction will get the exclusive lock on table A, just before the current transaction takes its exclusive lok on A?

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• How to not add values from Join

  - by nCdy

  SELECT ... FROM [Rep_GroupNode] C left join (SELECT .... if I'm using left join only for compare some thing due selecting how to not add(double) values from join ?

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• SQL Server 2005: Why would a delete from a temp table hang forever?

  - by Dr. Zim

  DELETE FROM #tItem_ID WHERE #tItem_ID.Item_ID NOT IN (SELECT DISTINCT Item_ID FROM Item_Keyword JOIN Keyword ON Item_Keyword.Keyword_ID = Keyword.Record_ID WHERE Keyword LIKE @tmpKW) The Keyword is %macaroni%. Both temp tables are 3300 items long. The inner select executes in under a second. All strings are nvarchar(249). All IDs are int. Any ideas? I executed it (it's in a stored proc) for over 12 minutes without it finishing.

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• i want to insert values from table1 to table2 with incremantal value

  - by adnan

  i tried something like this but the id value is not changing, getting the value for first record and set the value for all rest... insert into table1 (Id,b,c,d) (select (select max(Id)+1 from table1),x,y,z from table2 where... )

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• SQL OUTER JOIN with NEWID to generate random data for each row

  - by CL4NCY

  Hi, I want to generate some test data so for each row in a table I want to insert 10 random rows in another, see below: INSERT INTO CarFeatures (carID, featureID) SELECT C.ID, F.ID FROM dbo.Cars AS C OUTER APPLY ( SELECT TOP 10 ID FROM dbo.Features ORDER BY NEWID() ) AS F Only trouble is this returns the same values for each row. How do I order them randomly?

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• Is there a way to fix the length of drop down list?

  - by Harry Pham

  <select> <option>...</option> ... </select> Is there a way to fix the length of the drop down list.

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• How do I test the speed of a mySQL query?

  - by Chris

  I have a select and query like below... $sql = "SELECT * FROM notifications WHERE to_id='".$userid."' AND (alert_read != '1' OR user_read != '1') ORDER BY alert_time DESC"; $result = mysql_query($sql); how do I test how long the query took to run?

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• Can php query the results from a previous query?

  - by eaolson

  In some languages (ColdFusion comes to mind), you can run a query on the result set from a previous query. Is it possible to do something like that in php (with MySQL as the database)? I sort of want to do: $rs1 = do_query( "SELECT * FROM animals WHERE type = 'fish'" ); $rs2 = do_query( "SELECT * FROM rs1 WHERE name = 'trout'" );

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• How can I preform operations on rows in a Tabular form in MS access?

  - by Justin Tanner

  I have a Tabular type Form based upon a SELECT * FROM table type of query in MS access. I would like to: check / select rows in this form iterate through the checked / selected rows

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